What is the predominant factor causing an increase in strength during the initial weeks of training?

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During the initial weeks of training, the neuromuscular system adapts first, leading to improved neural recruitment and firing patterns, which allows for greater force production. This is known as neuromuscular adaptation and is the predominant factor causing an increase in strength during the initial weeks of training. Changes in whole muscle cross-sectional area (A) and increases in overall limb circumference (B) are more likely to occur later in a training program, after significant strength gains have already been made. Increases in muscle-fiber cross-sectional area (D) occur as a result of long-term resistance training, but are not the predominant factor causing strength increases during the initial weeks of training.

What Is the Predominant Factor Causing an Increase in Strength